Tube Amp Archive

6V6 power tubes and a GZ34 rectifier

A friend brought by a gorgeous Badcat Classic Deluxe for me to check out and it makes a weird electrical buzzing noise when you flick it off standby.
Any thoughts on what this could be. It sounds like something out of young Dr. Frankenstein's lab.

I've been troubleshooting a problem with a Rivera 100 duo twelve. V1 and half of V2 don't light up. (12ax7) I swapped the tubes with other 12ax7's that were lit up in the amp, and they don't glow either when put in the V1 & V2 positions. I checked a schematic and the filaments are supposed to get +1...

You have continuity from neutral to ground with the amp unplugged? That should not be, as the primary circuit should have no possible connection to ground with the ground cap gone. What is that ceramic cap doing there? That does not appear in the schematic. Be sure you haven't inadvertently made co...

I think this will do it. Once wired up this way I suggest putting a multimeter set to measure ohms across the AC line and neutral, and cycling the power switch through all its positions. You should see infinite resistance (open circuit) in the off position and the resistance of the PT primary on al...

If you can find a safe and appropriate way to mount individual caps, there is no need to get the expensive cans. You may need to install a small terminal strip or two. What's wrong with what's in there now? Is it really a hack job? Show us a picture. the amp started to hum. upon inspection, a coupl...

thanks for the tip about Antique Electronic Supply. I've been using CE distribution. Prices are a little less , but $50 min order and high shipping rate is a killer. Time to find some Caps! It looks like this amp used to have a multi-stage cap. Someone installed Sprague Atom 10/10 450V axial , but I...

thank you for the picture. after a long day it sure helps! I guess it goes without saying that the Cap gets snipped out as well right? BTW, is there a vendor of Electrolytics that anyone can recommend. The one place I normally deal with has a $50 min order. Not worth ordering $50 worth of stuff for ...

http://www.iwannarock.ca/ga40tb.html

does this help?
Black cloth wires go from PT to side of fuse and 2 switch.
Green Cloth wires go from PT to jewel light.

Hang on, the picture doesn't appear to match the schematic. My mistake for not checking first. Can you post another picture or two of that area? And can you identify which leads are the transformer primary? I'm thinking the black tubular cap is the one that goes to ground, is that right? Black cap ...

Ground clip... that's a new one! This looks pretty straight-forward. Clip out the death cap, run the hot (black) wire to the fuse holder, run the white to S1B (to the other side of the PT primary), and put the green (safety ground) on a dedicated bolt through the chassis. Wow, thanks for the speedy...

Hi everyone. I've been lurking here for quite awhile gathering helpful info, but it's time I need help. I've got a '64 Gibson GA40T (not the earlier tweed, the Crestline series) that I want to add a 3 prong ac cord to. I've done the same operation on my older Fender amps thanks to a wealth of info I...